I like the https://www.dfrobot.com/product-2014.html humidity/temp sensor for my dry/cure cabinet. Precise and fast.
I think the hardest part is setting up a user interface if you want to change parameters without a computer. Portions of my dry cabinet code could be helpful for you. I made a repository with Arduino code, schematic, and PCB layout. May be a good starting point, and if you ever need help with your project I’m happy to lend some eyes to help 
Thanks! LOL I was wondering if you or fuel would say something about it. That’s the outdoor mother of the seeds I selectively pollinated last summer. Really enjoyable smoke to me, hence the continuation of her genetics now. Let’s hope her daughters are also fantastic smokes 